GetNextPacket doesn't get a Message already received

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Hello:
I'm using M10Apilib to connect a M10 throw a serial port. The M10 already have 3 terminated messages but I'm not able to get the messages using GetNextPacket().
In the implementation, only code 1 and 5 (LLACK and STATUS) messages are obtained.
Can You tell me if is there something missing or wrong in the way I ask the messages for the DIGI M10?